"recompile with -fPIC" errors

Habitat Help
1

I’m working on a plan for a C++ app, and during make it blows up with a ton of errors like

/hab/pkgs/core/binutils/2.30/20180608050633/bin/ld.bfd.real: ext/libnatpmp/natpmp.o: relocation R_X86_64_32S against '.rodata' can not be used when making a PIE object; recompile with -fPIC

Here is the WIP plan source:

pkg_name=zerotier
pkg_origin=core
pkg_version="1.2.10"
pkg_maintainer="The Habitat Maintainers <humans@habitat.sh>"
pkg_license=("GPL-3.0")
pkg_description="A Smart Ethernet Switch for Earth"
pkg_upstream_url="https://github.com/zerotier/ZeroTierOne"
pkg_source="https://github.com/zerotier/ZeroTierOne/archive/${pkg_version}.tar.gz"
pkg_shasum="1c79ec57e67764079a77704b336e642ae3cf221dc8088b0cf9e9c81e0a9c0c57"
pkg_dirname="ZeroTierOne-${pkg_version}"

pkg_build_deps=(
  core/gcc
  core/make
)


pkg_deps=(
)


do_build() {
  make
  attach
}

do_install() {
  attach
}
2

Taking a look at this now.

1 Like
3

I’ve replicated this locally - troubleshooting.

4

Still working through this - digging deep into the gcc output and experimenting - I will update here before the end of my workday.

5

I was curious and tried compiling this on a fresh Linux VM with build-essential installed - make does indeed work there - so there’s something that isn’t quite working in the habitat build environment. We might be missing a flag somewhere - continuing to work on it.

6

Took some inspiration from the core/qemu plan and tried adding in the fPIC flag like this:

do_build() {
   export CFLAGS+=" -fPIC"
   build_line "CFLAGS are now: $CFLAGS"
   make
   attach
}

I confirmed that the flag does indeed appear to be set during the build:

zerotier: CFLAGS are now: -I/hab/pkgs/core/gcc/7.3.0/20180608051919/include -I/hab/pkgs/core/make/4.2.1/20180608100733/include -fPIC

However, I’m still getting the same errors. Researching further.

7

Heya,

I also took a bit of a peak at this. What I can say is that at the very least the error message is telling you the truth.

In this compile:

g++ -I/hab/pkgs/core/gcc/7.3.0/20180608051919/include -I/hab/pkgs/core/make/4.2.1/20180608100733/include -Wall -Wno-deprecated -std=c++11 -pthread  -DNDEBUG  -DZT_USE_MINIUPNPC -DMINIUPNP_STATICLIB -DMINIUPNPC_SET_SOCKET_TIMEOUT -DMINIUPNPC_GET_SRC_ADDR -D_BSD_SOURCE -D_DEFAULT_SOURCE -D_XOPEN_SOURCE=600 -DOS_STRING=\"Linux\" -DMINIUPNPC_VERSION_STRING=\"2.0\" -DUPNP_VERSION_STRING=\"UPnP/1.1\" -DENABLE_STRNATPMPERR -DZT_BUILD_PLATFORM=1 -DZT_BUILD_ARCHITECTURE=2 -DZT_SOFTWARE_UPDATE_DEFAULT="\"disable\"" -D_MT_ALLOCATOR_H -D_POOL_ALLOCATOR_H -D_EXTPTR_ALLOCATOR_H -D_DEBUG_ALLOCATOR_H -DZT_USE_X64_ASM_SALSA2012 -DZT_USE_FAST_X64_ED25519 -pie -Wl,-z,relro,-z,now -o zerotier-one node/C25519.o node/Capability.o node/CertificateOfMembership.o node/CertificateOfOwnership.o node/Identity.o node/IncomingPacket.o node/InetAddress.o node/Membership.o node/Multicaster.o node/Network.o node/NetworkConfig.o node/Node.o node/OutboundMulticast.o node/Packet.o node/Path.o node/Peer.o node/Poly1305.o node/Revocation.o node/Salsa20.o node/SelfAwareness.o node/SHA512.o node/Switch.o node/Tag.o node/Topology.o node/Trace.o node/Utils.o ext/x64-salsa2012-asm/salsa2012.o ext/ed25519-amd64-asm/choose_t.o ext/ed25519-amd64-asm/consts.o ext/ed25519-amd64-asm/fe25519_add.o ext/ed25519-amd64-asm/fe25519_freeze.o ext/ed25519-amd64-asm/fe25519_mul.o ext/ed25519-amd64-asm/fe25519_square.o ext/ed25519-amd64-asm/fe25519_sub.o ext/ed25519-amd64-asm/ge25519_add_p1p1.o ext/ed25519-amd64-asm/ge25519_dbl_p1p1.o ext/ed25519-amd64-asm/ge25519_nielsadd2.o ext/ed25519-amd64-asm/ge25519_nielsadd_p1p1.o ext/ed25519-amd64-asm/ge25519_p1p1_to_p2.o ext/ed25519-amd64-asm/ge25519_p1p1_to_p3.o ext/ed25519-amd64-asm/ge25519_pnielsadd_p1p1.o ext/ed25519-amd64-asm/heap_rootreplaced.o ext/ed25519-amd64-asm/heap_rootreplaced_1limb.o ext/ed25519-amd64-asm/heap_rootreplaced_2limbs.o ext/ed25519-amd64-asm/heap_rootreplaced_3limbs.o ext/ed25519-amd64-asm/sc25519_add.o ext/ed25519-amd64-asm/sc25519_barrett.o ext/ed25519-amd64-asm/sc25519_lt.o ext/ed25519-amd64-asm/sc25519_sub_nored.o ext/ed25519-amd64-asm/ull4_mul.o ext/ed25519-amd64-asm/fe25519_getparity.o ext/ed25519-amd64-asm/fe25519_invert.o ext/ed25519-amd64-asm/fe25519_iseq.o ext/ed25519-amd64-asm/fe25519_iszero.o ext/ed25519-amd64-asm/fe25519_neg.o ext/ed25519-amd64-asm/fe25519_pack.o ext/ed25519-amd64-asm/fe25519_pow2523.o ext/ed25519-amd64-asm/fe25519_setint.o ext/ed25519-amd64-asm/fe25519_unpack.o ext/ed25519-amd64-asm/ge25519_add.o ext/ed25519-amd64-asm/ge25519_base.o ext/ed25519-amd64-asm/ge25519_double.o ext/ed25519-amd64-asm/ge25519_double_scalarmult.o ext/ed25519-amd64-asm/ge25519_isneutral.o ext/ed25519-amd64-asm/ge25519_multi_scalarmult.o ext/ed25519-amd64-asm/ge25519_pack.o ext/ed25519-amd64-asm/ge25519_scalarmult_base.o ext/ed25519-amd64-asm/ge25519_unpackneg.o ext/ed25519-amd64-asm/hram.o ext/ed25519-amd64-asm/index_heap.o ext/ed25519-amd64-asm/sc25519_from32bytes.o ext/ed25519-amd64-asm/sc25519_from64bytes.o ext/ed25519-amd64-asm/sc25519_from_shortsc.o ext/ed25519-amd64-asm/sc25519_iszero.o ext/ed25519-amd64-asm/sc25519_mul.o ext/ed25519-amd64-asm/sc25519_mul_shortsc.o ext/ed25519-amd64-asm/sc25519_slide.o ext/ed25519-amd64-asm/sc25519_to32bytes.o ext/ed25519-amd64-asm/sc25519_window4.o ext/ed25519-amd64-asm/sign.o controller/EmbeddedNetworkController.o controller/DB.o controller/FileDB.o controller/RethinkDB.o osdep/ManagedRoute.o osdep/Http.o osdep/OSUtils.o service/SoftwareUpdater.o service/OneService.o osdep/LinuxEthernetTap.o osdep/PortMapper.o ext/miniupnpc/connecthostport.o ext/miniupnpc/igd_desc_parse.o ext/miniupnpc/minisoap.o ext/miniupnpc/minissdpc.o ext/miniupnpc/miniupnpc.o ext/miniupnpc/miniwget.o ext/miniupnpc/minixml.o ext/miniupnpc/portlistingparse.o ext/miniupnpc/receivedata.o ext/miniupnpc/upnpcommands.o ext/miniupnpc/upnpdev.o ext/miniupnpc/upnperrors.o ext/miniupnpc/upnpreplyparse.o ext/libnatpmp/natpmp.o ext/libnatpmp/getgateway.o ext/http-parser/http_parser.o one.o

We’ve asked for -pie.

But when you look at how the object files were created:

gcc -I/hab/pkgs/core/gcc/7.3.0/20180608051919/include -I/hab/pkgs/core/make/4.2.1/20180608100733/include -Wall -Wno-deprecated -pthread  -DNDEBUG  -DZT_USE_MINIUPNPC -DMINIUPNP_STATICLIB -DMINIUPNPC_SET_SOCKET_TIMEOUT -DMINIUPNPC_GET_SRC_ADDR -D_BSD_SOURCE -D_DEFAULT_SOURCE -D_XOPEN_SOURCE=600 -DOS_STRING=\"Linux\" -DMINIUPNPC_VERSION_STRING=\"2.0\" -DUPNP_VERSION_STRING=\"UPnP/1.1\" -DENABLE_STRNATPMPERR -DZT_BUILD_PLATFORM=1 -DZT_BUILD_ARCHITECTURE=2 -DZT_SOFTWARE_UPDATE_DEFAULT="\"disable\"" -D_MT_ALLOCATOR_H -D_POOL_ALLOCATOR_H -D_EXTPTR_ALLOCATOR_H -D_DEBUG_ALLOCATOR_H -DZT_USE_X64_ASM_SALSA2012 -DZT_USE_FAST_X64_ED25519 -I/hab/pkgs/core/gcc/7.3.0/20180608051919/include -I/hab/pkgs/core/make/4.2.1/20180608100733/include  -c -o ext/http-parser/http_parser.o ext/http-parser/http_parser.c

No -fPIC or -fPIE. So my guess right now is some logic in the Makefile related to CXXFLAGS has gone wrong.

The makefile behaves differently if CXXFLAGS is already set in the environment and isn’t adding -fPIC when it is.

8

Fixed it after examining the make-linux.mk file a little closer (ty for including your source code!)

Try this in your build section:

do_build() {
  export CFLAGS+=" -fPIC"
  export CXXFLAGS+=" -fPIC"
  build_line "CFLAGS are now: $CFLAGS"
  build_line "CXXFLAGS are now: $CXXFLAGS"
  make
  attach
}

Let us know if that works for you!

1 Like
9

@nellshamrell seems to have worked for me, thanks! Is this something that should merged into habitat’s default CFLAGS/CXXFLAGS or dealt with on a plan-by-plan basis?

10

Glad to help! I think it should stay plan by plan basis for now, but if this comes up again frequently then we can revisit adding it to the default :slight_smile:

1 Like